Allow Fiddle to pass in CLI args to Electron binary

[erickzhao]

Since we've added command line args to Fiddle, we lost the ability to pass in CLI flags to the Electron binary, which can be useful for certain users.

Ref #900 (comment)

[Crilum]

Hey, any progress on this?

[erickzhao]

Hi @Crilum, we're currently taking a break for the month of December, but I'll be putting it on my task list and hopefully getting it fixed for the next release.

[Crilum]

Ok, cool. 👍